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Funds Held for Clients and Corporate Investments (Details) - USD ($) $ in Millions | May. 31, 2015 | May. 31, 2014
--- | --- | ---
Type of issue: |  |  |
Funds held for clients money market securities and other cash equivalents, Amortized cost |  | $ 1,430.0 | $ 1,579.2
Funds held for clients money market securities and other cash equivalents, Gross unrealized gains |  | 0.0 | 0.0
Funds held for clients money market securities and other cash equivalents, Gross unrealized losses |  | 0.0 | 0.0
Funds held for clients money market securities and other cash equivalents, Fair value |  | 1,430.0 | 1,579.2
Available-for-sale securities: |  |  |
Amortized cost |  | 3,582.0 | 3,356.9
Gross unrealized gains |  | 21.1 | 37.5
Gross unrealized losses |  | (7.5) | (3.0)
Fair value |  | 3,595.6 | 3,391.4
Other, Amortized cost |  | 12.7 | 10.6
Other, Gross unrealized gains |  | 1.5 | 1.7
Other, Gross unrealized losses |  | 0.0 | 0.0
Other, Fair value |  | 14.2 | 12.3
Total funds held for clients and corporate investments, Amortized cost |  | 5,024.7 | 4,946.7
Total funds held for clients and corporate investments, Gross unrealized gains |  | 22.6 | 39.2
Total funds held for clients and corporate investments, Gross unrealized losses |  | (7.5) | (3.0)
Total funds held for clients and corporate investments, Fair value |  | 5,039.8 | 4,982.9
General obligation municipal bonds [Member] |  |  |
Available-for-sale securities: |  |  |
Amortized cost |  | 1,694.0 | 1,605.4
Gross unrealized gains |  | 14.0 | 25.0
Gross unrealized losses |  | (4.3) | (1.9)
Fair value |  | 1,703.7 | 1,628.5
Pre-refunded municipal bonds [Member] |  |  |
Available-for-sale securities: |  |  |
Amortized cost | [1] | 101.7 | 140.4
Gross unrealized gains | [1] | 1.0 | 2.4
Gross unrealized losses | [1] | 0.0 | 0.0
Fair value | [1] | 102.7 | 142.8
Revenue municipal bonds [Member] |  |  |
Available-for-sale securities: |  |  |
Amortized cost |  | 960.7 | 858.8
Gross unrealized gains |  | 6.1 | 10.1
Gross unrealized losses |  | (3.2) | (1.1)
Fair value |  | 963.6 | 867.8
Variable rate demand notes [Member] |  |  |
Available-for-sale securities: |  |  |
Amortized cost |  | 825.6 | 752.3
Gross unrealized gains |  | 0.0 | 0.0
Gross unrealized losses |  | 0.0 | 0.0
Fair value |  | $ 825.6 | $ 752.3
[1] | (1) Pre-refunded municipal bonds are secured by an escrow fund of U.S. government obligations.

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